The total energy--momentum tensor for electromagnetic fields in a dielectric

There are various formulations of energy--momentum tensors for an electromagnetic field in a linear dielectric. The total energy--momentum tensor, comprised of electromagnetic and material components, must be unique. We discuss the construction of the total energy--momentum tensor and the associated conservation laws.Comment: Added publication informatio

Edge-Transitive Bipartite Direct Products

In their recent paper ``Edge-transitive products, Hammack, Imrich, and Klavzar showed that the direct product of connected, non-bipartite graphs is edge-transitive if and only if both factors are edge-transitive, and at least one is arc-transitive. However, little is known when the product is bipartite. This thesis extends this result (in part) for the case of bipartite graphs using a new technique called stacking. For R-thin, connected, bipartite graphs A and B, we show that A x B is arc-transitive if and only if A and B are both arc-transitive. Further, we show A x B is edge-transitive only if at least one of A, B is also edge-transitive, and give evidence that strongly suggests that in fact both factors must be edge-transitive

Progressing diversity in HRD theory and practice

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An Introspection: Get the Caravan Moving

The author\u27s reflection about cultural activism and his role and involvement in the Afrikan Hiphop Caravan, in particular the experiences he collected along the road, travelling with the comrades